Ellipsograph.



No.783,009. PATENTED FEB.21,1905. H. o, BARNES.

ELLIISOGRAPH.

rum-non rumn 11.22.1004.

aumnhl 198M000; r

I I l In all whom. it may concern:

. slfia Be it known that l. llxuur U. llaaxns. a citi-.

3.. zen of the United States, residing at Oakland. 1.1;. m the eountyot' Alameda mul Stateot' (Zaht'or- 5 nia,-have invented new and useful improve- ;Ay: meats in Eltipsographs, of which the follow- 3 ing is a. speeihcation.

My invention relates to an ap mratus which ""is especially designed for the production of ti ,0' ellipses or similar curved outlines. such as are Q11" employed in the dra't'tsnians profession. r I a My invention consists of the parts and the "t, constructions and comhimttions of parts herei-s'diinal'ter descrihed mul claimed. 5' Figure l is a perspective view showing the "applieation of my device. Fig. 2 is a section t of the head-joint. Fig. 3 isa modification to referred to. Fig. 4 is a top view of the "1 1' Joint shown in Fig. 3. Fig. 5 is aside view ol' the head-jointot Fig. l. ln mechanical drawing many or most of the ellipses which are required to he shown are s'fifi? representations of ohlioue projections of cirfj f-f eular forms in which the angle of ohliouity is 5".fintl ict\te(l and measurements of the required nnuor and nnnor axcsare readily ohtained. ms;- My apparatus isdcsignml to ra lltll,\' and ac- .itfeurately produce such elliptiea tignres hy 3 means of the following ap aratus: 39,. A aml liaro two legs jointed or pivoted to- 43, gether at the top. as shown at .l. mul adapted ;I.f'.;to he closed for convenience in packing or ,i-fr s'scparated when in use. The heads of these stwo legs are united hr a rule or similar joint. .135 which is turnahle about a pin 3. which proiffy-J00! and serves as a pivot-or hinge support for the leg 4. which I will term the axial rfi' lcg and which carries the marking or in- "scrihing K!" or pencil, as will he hereinafter 49.deserihetl. 'lhe semicircular heads 5 of the 1;. B-legs A and ii are separated to a considerahle ;.extent at the side opposite the legs, and when the legs are spread a nut the limit of their -'f sepnratlon will he attamcd when the two sepa- 45 rated ends of the rims 5 are hronght together. 1 4110 pin 3 of the axial leg has a tlange or disk 7356. against the face of which the segments r.

gjgare titted and are held h,' the nut '15, I

BES-T AVAILABLE-gee axed February 21, 1905.

OFFICE- ome cgiiAususOr ease/inn, comma; ASSltlNtHt or ONE-'lttlttl) 'ro aauou '1'. season, or anaannm. CALIFtHtNM.

ELLIPSOGRAPH.

SPECIFICATION forming part of Letters Patent No. 783.009, dated February 21, 1905.

Application no January 22,1004.- Serial No. 100.102.

screws upon the o mositecnd of the pin 3. and thus clamps the head of the legs A mul li against the disk ti. This disk has a pin :1 projecting from it lartwccn the separated ends of the segments a), and this serves as a stop against which these ends strike when the legs have heen separated to the proposed limit. .'\t the same time the. relntionot' the pin 8 to the pin 3 and the axial leg -l is such that the latter will when the legs A am] it have hecn separated he placed upon an axial line equidistant from the two legs and ii. Thus the major axis of the ellipse will he found upon this line. The axial l gl. as l have termed it. has a point, and this point is set upon the junction of the majorand minor axesot' the proposed ellipse. It the ellipse is to he short. the axial leg will he. hronght nearer to the separated legs A mul li. ll the ellipse is to he. much elongated. this lcg will he moved further awa,v.with a correspoiuling elongation of the ellipse. 'l'his axial l g carries a pen. pencil. or other marking-point. or hot-h, and such marking device, as at t). is hinged or pivoted, as at I". to a sleeve ll. which is slidnhle aml turnahle upon the axial leg t. Thus when said leg has hecn set. at its proper point. with relation to the supporting-legs A and It the sleeve It may he slipped down until the marking-pointcan he adjusted to contact with the surl'nce to he marked at one end of the minor axisol' the proposed ellipse. From this point the marking-point may he moved around the axial leg hy reason of the t-uhular support. aml as it is moved out-ward it will also he sli ped down along the axial leg. so as to maintain the mint in contact with the surface until it reaches the outward extremity of the major axis ol' the proposed ellipse.

It is convenient to commence the inscription of the ellipse upon one side rather than at the end of the ellipse in order to more readily start the ink llowing. With the pencil or other mxu'kingwint any point of starting which may he convenient may he assumed. and when the point. has been moved around the ohllunely-sup mrted axial leg with the 9 7. which markigg-miint constantly in mutant with "sit r face itf'w'ill he found that amen. s x'it,|, il .s swe fr t x:1

lique e,\'liadrieal projection outlined as determined; 1

- .ln lil!.'"3 lillustrateamodilied construc- .tion wherein a'single leg'zA' serves'asthe supsport, said leg being jointed 'at..12 and'supporting a socket 13., pivoted. atI-l3'. .lnthe. socket is mounted-to slide the'isupplemental leg 4'. said leg 4' being clamped at any point I of adjustment by a screwfl t; -'.ln.this ease l have shown this leg 4';asbaving astraight point at. one end and aeurved point at the opposite end. This latter point isserviceable where the proportionatelengthot' the 5 major axis of the ellipse is very great. and

the point tints formed will stand more vertical to the surface upon which the ellipse is inscribed than if the straight point were used and projecting in line with the axial leg. The

marking device or pen 9 is in this case shown as pivoted to a link 16, and this link is pivoted to the part 10, projecting from the c,\'- lindrical sleeve ll, as previously described. With this construction the tnarking portion J 's-may be adjusted by means of tbe link 16 and.

the revoluble slide I i. so as to move about the axial leg and produce single or concentric homologous ellipses, as may be desired, with no change in adjustment other than that of 3 the link Hi.

Having thus dcscrilmd my invention, what I claim, and desire to secure by Letters lateat, is I I. An ellipsograph having in combination a jointed support, a leg pivoted at one side or and indtmendentol' the joiutof the support.

"B Alf ABte cePv 'a' sleeve slidabl mounted on said leg, and a fn'tarkin'g-point carriedb the sleeve. "2.1:;1An instrument [or the inscription of ob- -lique projections oFcircles and the like, said .4 instrumentconsistingof a pair of point-ed supporting-legs, a joint. at the head and a central pin aboutwhieh the lc'gs are turnable, segmeutal heads'for the supporting-legs, said heads being separated when the legs are closed, and approaching each other when the legs are opened, a disk upon the center pin against the ime 0f ,whic h disk the segments contact, and a stop'fpinprojecting from said disk between thesegments, a leg hinged to the outer end of- 5 the center pin'of thesupporting-legsaml tnrnable in the plane which passes through the pin which projects front the disk whereby said leg is restricted to adjustment in a plane bisecting the angle formed by the supportinglegs, and a marking-point carried by and revoluble about said le 3. An ellipsograph having in combimtt-ion a pair of )lVOl-Otl supporting-legs, a pivotalLvmountet third leg and means whereby it is re- 9 stricted in adjustment in a plane bisecting the maximum angle formed by the supportinglegs, and a slidable sleeve and marking-point t'et'oluble. about said third leg.

In testimony whereof I have hereunto set 5 my hand in presence of two subscribing witncsses.

llAlllt-Y t3. BAR-Nl'lb.

W i tnesses:

U. M. Wurrn, 'l. J. Noose. 

